Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bde2e9bbef758d5…

MALICIOUS

PDF

85.3 KB Created: 2021-07-17 23:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c6a2185f390ced5ed215d123fae346ce SHA-1: 3979b9f9d41268100f291ba64c1c7b34bbd09537 SHA-256: 6bde2e9bbef758d57d48921dec36c2bf7d522308a4b3e9fe475ceae70f1d7d75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, specifically within form upload plugin directories. This structure strongly suggests a link farm designed to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection further corroborate the malicious nature of this PDF. No scripts were extracted, but the overall pattern indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160da9ee33737d---wimajok.pdf In PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/ua98j8gqvosrrtm43gl7rlhcol/puwetuwawiluwujowifejir.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f7badc865---gulatewuneveme.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/6dq7jb73373p5j509i22l7ilo3/47866355311.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dcc60d8e7---54628708880.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/1732214085.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/37777738024.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/jclh5snindst13uht9519m8rs4/rabipukurozaniwof.pdfIn PDF document text
    • http://flgr.ru/files/files/72563584880.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0ff485f01471c437a7c9ba07762a086d/laxax.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/07/07/62947408144.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf07858a1---5561895348.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/52256230385.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7abdd930fd---83057582880.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/9976gnrg67f8q18j9nal4fkqd1/vuxugawobibubezopodas.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/j0u6rivpkn4q5v047rh6j7f7f6/95048717578.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720f21a5110---kobaluliw.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/85638243875.pdfIn PDF document text
    • https://amblamy.ee/upload/file/ropotepezagax.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/48846174462.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210610172955_1362541760.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607371e340c49---pobexafiraxeko.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085856f885bc---rawirikekipafabigapoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+protocol+is+required+for+homegroup+to+work+in+windows+7PDF link annotation
    • https://www.microsoft.com/windows/windows-7/what-is-windows-7.aspIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10168 16496 bytes
SHA-256: ff5e5d723e46d96ec23cd1a7c68d2f151170ee674e21006be7317cc817fd9afb
font_02_sfnt_off00012c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6E 11536 bytes
SHA-256: 50bc06591ee5a92b792be62943e1bb3a559f4a73d371d1ecaf0d723345f76a69

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